Possible Duplicate:
Windows 7 ALT-TAB - How to turn off previewing the window
When I used to hit'alt + tab' I would get a list of screens and I could 'thumb' though them. Now, however if I stay on that screen for too long in the list the screen basically shows up. I dont want this to happen as it happens too quickly, and I want to keep the list of screens up and look through them, but Windows shows a temporary preview of the screen I am about to select.